Augmented reality (AR) displays become more and more popular recently, because of its high intuitiveness for humans and high-quality head-mounted display have rapidly developed. To achieve such displays with augmented information, highly accurate image registration or ego-positioning are required, but little attention have been paid for out-door environments. This paper presents a method for ego-positioning in outdoor environments with low cost monocular cameras. To reduce the computational and memory requirements as well as the communication overheads, we formulate the model compression algorithm as a weighted k-cover problem for better preserving model structures. Specifically for real-world vision-based positioning applications, we consider the issues with large scene change and propose a model update algorithm to tackle these problems. A long- term positioning dataset with more than one month, 106 sessions, and 14,275 images is constructed. Based on both local and up-to-date models constructed in our approach, extensive experimental results show that high positioning accuracy (mean ~ 30.9cm, stdev. ~ 15.4cm) can be achieved, which outperforms existing vision-based algorithms.
@article{arxiv.1506.05870,
title = {To Know Where We Are: Vision-Based Positioning in Outdoor Environments},
author = {Kuan-Wen Chen and Chun-Hsin Wang and Xiao Wei and Qiao Liang and Ming-Hsuan Yang and Chu-Song Chen and Yi-Ping Hung},
journal= {arXiv preprint arXiv:1506.05870},
year = {2015}
}